Re: [T3] horn internals

[Virginia & Peter <ginger@parkerdurost.org>]

<x-flowed>   I get it now!  OK, this will be my line of action.  I've gone from 
corrosion/open circuit to closed circuit.  There's really not much else 
I can do but pry off the seal and tweak the plate adjuster.  Thanks all.

Peter Parker
'66 Square; Phillip
Portland, OR

Dave Hall wrote:

> It should be mendable since the coil has electrical conductivity through it. In
> the ones I've seen, the flat plate of metal is pulled towards the electromagnet,
> and the movement opens the contacts again.  Check the contacts are clean.  Then
> it's a matter of getting the separation right between the metal plate and the
> electromagnet so the circuit is closed normally and opens as the plate moves
> towards the e/m.
> I found a thin card gasket was needed between the sounding plate and base -
> there should be thin gaskets on the flange.  Sometimes pushing the cover in a
> bit will make it work as it moves the diaphragm and metal plate in a bit.  The
> adjustment screws are often resined in, and I've not tried cleaning out the
> stuff, but it might be possible to get adjustment that way.
>
> Assuming you didn't find bits of broken mechanism and the coil is not burnt out,
> it should be repairable.
>
> Dave.
> UK VW Type 3 & 4 Club
> http://www.hallvw.clara.co.uk/
> ------
> ----- Original Message ----- 
> From: "Virginia & Peter" <ginger@parkerdurost.org>
> To: <type3@vwtype3.org>
> Sent: Wednesday, April 19, 2006 8:32 AM
> Subject: [T3] horn internals
>
>
>  
>
> >    I'm surprised this hasn't happened sooner, but after hanging under
> > the bumper for 40 years, the horn finaly died. It had power and with a
> > good ground still no-go.  When tested with MM had a very high resistance
> > circuit across terminals.   I opened it up to find some moisture, and a
> > small amount of corrosion/crud between the two metal strips.  Now I've
> > got a good circuit, drawing 3A at 6V, but no noise.
> >    Any ideas?  This is such a simple circuit, but I really don't
> > understand what creates the vibration/oscilation.  The crud was on what
> > I believe is the "hammer" tip.  I'm sure I can get another horn, but now
> > I'm curious how it works.
> >
> > Peter Parker
> > '66 Square; Phillip
> > Portland, OR
> >    
>
>
>
>
>  

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</x-flowed>